What Is a Mondor's Cord? The Tender Line After Breast Surgery

Someone sent me a photo asking what the firm, tender line running under their breast was. I can't diagnose anyone or give medical advice online, and I won't try to. But I'm fairly confident I know what's being described, and it's common enough after breast surgery that it's worth explaining in general terms.

What they're almost certainly looking at is a Mondor's cord.

A Mondor's cord is an inflamed vein sitting right under the skin.

The formal name for it is superficial thrombophlebitis, which sounds far more alarming than the thing itself. Break the word apart and it just describes what's happening: inflammation of a superficial vein.

Because it's a vein rather than scar tissue or a mass, it presents the way a cord would. You can often feel it as a distinct firm line, and sometimes see it tenting the skin.

We see these relatively frequently with breast surgery.

They're almost always in the crease underneath the breast. That's the classic location and the one most patients notice.

But they're not restricted to it. You can get them in other places too, and I've even seen them in the cleavage line.

Since the vein is inflamed, Mondor's cords are often tender. It will not feel good if you press on the area.

That tenderness is usually what sends people looking for answers, and it's a reasonable thing to be bothered by. It's also, importantly, an expected feature of the problem rather than a sign that something has gone wrong.

Here's the reassuring part: in general, these disappear on their own in four to six weeks.

Patients are typically started on an NSAID like Motrin, which does two useful things at once:

• It helps the cord resolve
• It helps with the tenderness in the meantime

That's usually the entire treatment plan. No procedure, no intervention beyond the Motrin and some patience.

One caveat worth stating plainly: ask your own surgeon before starting any NSAID after surgery. Some surgeons restrict anti-inflammatories during particular windows of recovery for reasons specific to your operation, so this is a conversation to have rather than an assumption to make.

Every once in a while, you'll get a really persistent cord that keeps bothering the patient well past the usual window.

Those can be treated. We can get rid of them by injecting either 5-FU or a steroid into the area, which are the same two medications we reach for with problematic scars. The injection settles the inflammation down directly rather than waiting it out.

This is the exception, not the rule. Most cords never need anything.

I want to end where I started.

Follow up with your surgeon to make sure that's all this is. A firm, tender line under the breast after surgery is very often a Mondor's cord, and Mondor's cords are benign and self-limiting. But "very often" is not "always," and the only way to know what you're dealing with is to have someone examine you who knows your anatomy and your operation.

That's exactly the kind of thing your surgeon should want to see you for. A quick visit to confirm a benign finding is a good use of everyone's time, and it beats months of wondering. The same logic applies to anything else that shows up during healing and doesn't match what you expected.

A Mondor's cord is an inflamed superficial vein under the skin, formally called superficial thrombophlebitis. It shows up relatively often after breast surgery, almost always in the crease beneath the breast, though it can appear elsewhere including the cleavage line.

It's tender, which is normal for it, and it typically resolves on its own in four to six weeks with an NSAID like Motrin as the only treatment. The occasional stubborn one can be injected with 5-FU or a steroid to speed things along.

None of that replaces being examined. Show it to your surgeon, confirm that's what it is, and then let it run its course.